[Afferent influences of the vagus nerves on the vasomotor center during cat ontogenesis].

It has been found in cats under urethane anaesthesia that already in newborn animals the reactions of arterial blood pressure to test stimulation of the central end of one vagal nerve could be increased, depressed or reversed during the conditioned pre-stimulation of the central end of contralateral vagal nerve. During the conditioned stimulation, polyphasic changes were observed in the modulating effect which was different for pressor and depressor test-responses and exhibited complex changes in ontogenesis.